Snatch-block



(No Mode-1.)

G. HARVEY. SNATGH BLOCK.

No. 487,734. Patented Deo. 1s, 1892.

UNTTEE STATEs PATENT TErcE GEORGE HARVEY, OF SAN FRANCISCO, CALIFORNIA.

SNATCH-BLOCK.

SPECIFICATION forming part Of Letters Patent No. 487,734, dated.December 13, 1892.

Application filed August 10, 1892. Serial No. 442,705. (No model.)

To @ZZ whom it may concern.-

Beit known that I, GEORGE HARVEY, a citizen of the United States.residing at San Francisco, in the county of San 'Francisco and State ofCalifornia, have invented a new and useful Snatch-Block, of which thefollowing is a specification.

My invention relates to improvements in snatch-blocks, the object inView being to provide a simple, cheap, and durable block which will havethe requisite strength to withstand the strain to which such devices areordinarily subjected and which may be readily opened and closed for thepurpose of inserting and removing the cable.

A further object of my invention is to provide improved means forlocking the removable cheek-piece in place.

A further object of my invention is to pro vide means for preventing therope or cable from working between the sides of the pulley and the innersurfaces of the cheek-pieces.

Further objects' and advantages of my invention will appear in thefollowing description, and the novel features thereof will beparticularly pointed out in the appended claims. A

In the drawings, Figure l is a perspective view of a snatch-blockembodying my invention. Fig. 2 is a vertical central sectional view ofthe same. Fig. 3 is a detail perspective View of the cam-lever detached.Fig. 4 is a similar view of the removable cheek-piece detached. Fig. 5is a similar view of the head and cross-bar detached.

A A represent the cheek pieces or plates, near the lower ends of whichAare registering openings a a, in which is arranged the transversepivot-pin B. The extremities of this pivot-pin, which pass through thecheek-- plates, are reduced, as seen at C C, thus forming shoulders D D,against which the cheekplates bear to hold them out of contact with thesides of the interposed pulley E. The intermediate portion of thepivot-pin is made large to form a rm bearing for the pulley, as shown.

The removable cheek-plate, which is designated as a', is adapted to bedisengaged from that end of the pivot-pin which extends therethrough,and to the laterally-proj ectin g end of said pin is pivotally connectedthe cam-lever F. The cam-lever is bifurcated to enable its branches tolie upon opposite sides of the end of the pivot, the same 'being securedthereto by a transverse pin f.

In registering apertures g g at the upper ends of the cheek-plates ismounted the transverse bar G, which is adapted to turn in its bearings,that end of said bar which passes through the removable cheek-platebeing provided with a short lateral stud H, as shown. The free end ofthe cam-lever is provided with an eye l to fit the projecting end of thecrossbar G, said eye being provided with a notch K to pass over thelateral stud upon said cross-bar.

vL represents the hook or bail, which is swiveled in the head G',carried by the cross-bar, said hook being headed below the head G toprevent detachment. When the hook is in the position shown in Fig. l infull lines, the transverse or lateral stud which is carried by thecross-bar is out of alignment with the notch in the eye of thecam-lever, and therefore the lever is held firmly in place with its camspressing against the outer surface of the removable cheek-plate. Whenthe hook is turned to the position shown in dotted lines in said ligureor horizontal, the said stud is in alignment with the notch in the eyeof the cam-lever, and the free end of'the latter may be swung outwardly,as shown in dotted lines in Fig. 2, to remove the pressure of the camsfrom the cheek-plate, and thus allow said plate to be swung laterally,as shown in dotted lines in Fig. 2, for the insertion of the cable.

To the inner surfaces of the cheek-plates and following closely thecontour of the pulley are secured the curved guiding-ribs M M, which areprovided at their inner edges with shoulders to cover the intervalbetween the side of the pulley and the surface of the plate and taperedtoward their outer edges, as shown, whereby the cable is prevented frombecoming jammed therebetween and provide a smooth running surface forthe cable.

The operation of my improved snatch-block will be readily understoodfrom the foregoing description.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is

l. In a snatch-block, the combination, with the parallel clleeloplates,011e of which is removable, the pulley and the pivot-pin upon which saidpulley is mounted, of the cam-lever fulcrumed upon the projecting end ofsaid pivot-pin and bearing against the outer surface of the removablecheek-plate to hold it in place, substantially as specified.

2. In a snatch-block, the combination, with the cheek-plates, one ofwhich is removable, the pulley, and the pivot-pin having an enlargedbody portion and reduced extremities which extend through thecheek-plates, of the eam-leverpivotally connected to the extremity ofthe pivot-pin in juxtaposition to the removable cheek-plate, and meansfor securing the free end of said lever, substantially as specified.

In a snatch-block, the combination, with the cheek-plates connectedbyapivot-pin provided With shoulders to bear against the inner su rfacesof said cheek-plates, of the crossbar mounted in apertures in the upperends of the cheek-plates and carrying a hook or bail and a lateral stud,and the cam-lever fulcrumed upon the projecting end of the pivotpinand-provided with an eye-having,r anotch to receive the projecting endof said crossbar, substantially as specified.

4. In combination with a snatch-block having a removable cheekplate,acam-lever fulcrumed thereto in proximity to the removable cheek-plateand adapted to engage the same to hold it in its operative position,substantially as specified.

In testimony that I claim the foregoing as my own I have hereto axed mysignature in the presence of two witnesses.

GEORGE HARVEY.

XVitnesses:

JOHN H. CARAH, ARTHUR BARNES.

